/*
 * Copyright 2017-2019 Allegro.pl
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { Duration } from "chronoshift";
import { Expression } from "plywood";

type FilterExpression = Expression;

export enum TimeShiftEnvType { CURRENT, WITH_PREVIOUS }

interface TimeShiftEnvBase {
  type: TimeShiftEnvType;
}

export interface TimeShiftEnvCurrent extends TimeShiftEnvBase {
  type: TimeShiftEnvType.CURRENT;
}

export interface TimeShiftEnvWithPrevious extends TimeShiftEnvBase {
  type: TimeShiftEnvType.WITH_PREVIOUS;
  shift: Duration;
  currentFilter: FilterExpression;
  previousFilter: FilterExpression;
}

export type TimeShiftEnv = TimeShiftEnvCurrent | TimeShiftEnvWithPrevious;
